I'm considering two steel columns inside a shear wall in order to enhance the lateral resistance. I was wondering how I can calculate f11 and f22 for inserting in Etabs?
Thanks
Dear Negar Kamali
i believe you should first analyze your structure by assuming the said parameters as 1 , after the analysis check the stress contours for both , if the stress surpassed the the concrete strength you should then apply the modifiers which are given in codes ,for instance ACI suggests 0.35 and 0.7 for bending and compression
this is what we do in a normal concrete shear wall , i don't think there is a difference when u have steel boundary elements but if you don't want to take the risk i suggest check if there was a finite element model about it ,
or model 1 for yourself and and check if stiffness degradation is the same after cracking (note that you should analyze in a manner so the concrete will crack) then you use your own modifiers since it has research backgrounds
sorry for the long comment hope it was helpfull
best regards
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